Zakah on Camels (Hadith No. 1187)

Hadith no. 1185 and no. 1186 (below) are repeats. Read the post here.
Volume 2, Book 24, Number 526:
Narrated Abu Sa'id Al-Khudri :
Allah's Apostle said, "There is no Zakat on less than five camels and also there is no Zakat on less than five Awaq (of silver). (5 Awaq = 22 Fransa Riyals of Yamen or 200 Dirhams.) And there is no Zakat on less than five Awsuq. (A special measure of food-grains, and one Wasq equals 60 Sa's.) (For gold 20, Dinars i.e. equal to 12 Guinea English. No Zakat for less than 12 Guinea (English) of gold or for silver less than 22 Fransa Riyals of Yamen.)
Volume 2, Book 24, Number 527:
Narrated Abi Sa'id Al-Khudri :
I heard the Prophet saying (as above-No. 526)

Today's Hadith:

Volume 2, Book 24, Number 528:
Narrated Anas (radiallaahu `anhu):
Abu Bakr (radiallaahu `anhuwrote to me what Allah had instructed His Apostle (sallallaahu `alayhi wasallam) to do regarding the one who had to pay one Bint Makhad (i.e. one year-old she-camel) as Zakat, and he did not have it but had got Bint Labun (two year old she-camel). (He wrote that) it could be accepted from him as Zakat, and the collector of Zakat would return him 20 Dirhams or two sheep; and if the Zakat payer had not a Bint Makhad, but he had Ibn Labun (a two year old he-camel) then it could be accepted as his Zakat, but he would not be paid anything.
The basic principle concerning this is the hadeeth narrated by al-Bukhaari (1454) from Anas, according to which Abu Bakr (may Allaah be pleased with him) wrote this letter to him when he sent him to Bahrain:
In the name of Allaah, the most Gracious, the Most Merciful. This is the obligation of zakaah which the Messenger of Allaah (peace and blessings of Allaah be upon him) enjoined upon the Muslims and which Allaah enjoined upon His Messenger. Whoever among the Muslims is asked for it in the proper manner, let him give it, and whoever is asked for more than that, let him not give. For twenty-four camels or less, for each five, one sheep. If the number reaches twenty-five up to thirty-five, then a female bint makhaad (a she-camel in its second year) is due. If the number reaches thirty-six up to forty-five, then a female bint laboon (a she-camel in its third year) is due. If the number reaches forty-six up to sixty, then a hiqqah (a she-camel in its fourth year) is due. If the number reaches sixty-one up to seventy-five, then a jadha’ah (a she-camel in its fifth year) is due. If the number reaches seventy-six up to ninety then two bint laboon are due (she-camels in their third year). If the number reaches ninety-one up to one hundred and twenty, then two hiqqah are due (she-camels in their fourth year…). If there are more than one hundred and twenty, then for every forty a bint laboon is due and for every fifty a hiqqah. Whoever has no more than four camels does not have to pay zakaah on them unless their owner wants to give. If the number reaches five camels, then one sheep is due…” 
A bint makhaad is a camel that has completed one year.
A bint laboon is one that has completed two years.
A hiqqah is one that has completed three years.
A jadha’ah is one that has completed four years.
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